One large problem is that the warbird movement contains its fair share of Walter Mitty types, guys who want to play military pilot never having been one or been through the training. These particular types want to be able to dress the part of fighter pilot, and they are wealthy so they have the dollars to not only do that, but to purchase a high dollar, and high performance, warbird to complete the picture.
Unfortunately like their wealth, they possess an equally large (or larger) ego that doesn’t allow them to have any realization that their knowledge, skill, abilities, training and currency may not be where it needs to be for having the SA to be piloting aircraft of this caliber, even though more experienced people may be telling them so. They end up getting themselves into a square corner that they can’t get themselves out of, resulting in killing themselves, killing others in the air or on the ground, and/or destroying an irreplaceable aircraft.
Have seen it happen before, 10 years ago at my old former airfield in fact, where a guy matching the above destroyed a warbird and morted himself in the process.